Brake Master Cylinder Structure

The master pump is usually composed of a cylinder, a piston, a piston return spring, a compound valve (oil control valve), a leather cup, and an apron. The cylinder body is divided into upper and lower liquid storage chambers and working cylinder chambers. The piston is installed into the cylinder from the rear end of the cylinder body, and the cylinder body is divided into front and rear chambers. For the oil return hole, the large hole leading to the storage chamber from the rear working cylinder in front of the apron and behind the top of the piston is the liquid inlet hole (compensation hole). The installation position of the master pump is behind the inlet of the piston.